Discoid Lupus

Overview

Discoid lupus is the most common form of chronic cutaneous (skin) lupus, an autoimmune condition in which the immune system attacks the skin. It causes round, coin-shaped ("discoid") patches that are scaly and discolored and tend to appear on areas exposed to the sun, such as the face, ears, and scalp.

Discoid lupus mainly affects the skin and, unlike systemic lupus erythematosus (SLE), usually does not damage internal organs. However, a small number of people with discoid lupus go on to develop systemic lupus, so monitoring is important. The patches can heal with scarring, color changes, and permanent hair loss if they affect the scalp, which makes early treatment and sun protection important.

Because sunlight strongly triggers the rash, sun protection is a cornerstone of care, and treatment aims to calm active patches before they leave lasting marks. Although discoid lupus is mainly a skin condition, doctors keep an eye out for any signs of wider, systemic disease, since a minority of people progress to it over time.

Symptoms

Discoid lupus mainly affects the skin. Typical features include:

• Round or coin-shaped patches that are red or discolored and scaly
• Patches with raised, well-defined edges that may have a thick, adherent scale
• Areas that, as they heal, leave scars and changes in color (lighter or darker)
• Hair loss, which can be permanent if patches scar the scalp
• Lesions in the ears, on the lips, or inside the mouth
• Worsening with sun exposure

The patches are usually not very itchy or painful but can be disfiguring. New patches, ulcers, or any sore that does not heal should be evaluated.

Causes

Discoid lupus is an autoimmune condition, meaning the immune system mistakenly targets the body's own skin. The exact cause is not fully understood, but it is thought to result from a combination of genetic susceptibility and environmental triggers.

The most important trigger is ultraviolet light from the sun, which can bring on new patches or worsen existing ones. Smoking is also linked to more severe disease and poorer response to treatment. The condition is not contagious and is not caused by anything a person did.

Risk Factors

• Being a woman, as it is more common in women
• Adulthood, with most cases starting between the ages of 20 and 50
• Sun exposure
• Smoking
• A personal or family history of lupus or other autoimmune disease

Diagnosis

Discoid lupus is diagnosed by examining the skin and confirming the findings with tests:

• Skin examination: Recognizing the characteristic discoid patches and their distribution.
• Skin biopsy: Taking a small sample to confirm the diagnosis under the microscope, which is the key test.
• Blood tests: To check for autoantibodies and screen for systemic lupus, since a minority of people progress to it.

Treatment

Treatment aims to control the rash, prevent new patches, and limit scarring. Strict sun protection is central to every plan.

• Sun protection: Daily broad-spectrum sunscreen, protective clothing, and avoiding strong sun, as ultraviolet light is a major trigger.
• Topical treatments: Corticosteroid creams or other anti-inflammatory creams applied to the patches.
• Antimalarial medication: Drugs such as hydroxychloroquine are commonly used to control the disease and are often very effective.
• Other medications: Stronger immune-modulating treatments may be used for severe or resistant disease.
• Stopping smoking: Which can improve the response to treatment.

Early treatment helps reduce permanent scarring and hair loss, and ongoing care helps keep the disease controlled over the long term.

Prevention and Self-Care

• Use broad-spectrum sunscreen every day and reapply when outdoors
• Wear wide-brimmed hats and protective clothing and seek shade
• Stop smoking, which worsens the disease and reduces treatment response
• Use prescribed creams and medications consistently and attend follow-up
• Report new patches, non-healing sores, or symptoms such as joint pain or fatigue that might suggest systemic involvement

When to See a Doctor

See a doctor or dermatologist if you develop round, scaly, discolored skin patches that persist, scar, or cause hair loss, so that the diagnosis can be confirmed and treatment started early to limit permanent damage.

Also see your doctor if you develop joint pain, fatigue, fever, mouth ulcers, or other body-wide symptoms, as these may indicate systemic lupus, and have any sore or patch that does not heal or changes over time checked promptly.

Related Topics

Frequently Asked Questions

References

1. American Academy of Dermatology. Lupus and the skin.
2. Mayo Clinic. Lupus.
3. National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Lupus.
4. MedlinePlus, U.S. National Library of Medicine. Discoid lupus erythematosus.